Calculate 300 Index Values within GeoMaster

The 300 Index is a measure of site productivity, representing the mean annual increment of stem volume of a Radiata crop at age 30 with a stocking of 300 SPH. This is often used for planning forest management activity and monitoring site productivity. GeoMaster includes the ability to calculate and update the 300 Index for a ‘patch’. A ‘patch’ being a single piece of land with a consistent land use and treatment history i.e. a stand may contain multiple patches.

Parameters obtained from GeoMaster (required fields) for use in the calculation of the 300 Index include:

Latitude, Longitude (obtained automatically via the GIS), Altitude

Planting Date

Species

Initial Stocking

Pruning’s (age, pruned height, pruned SPH)

Thinning’s (age residual SPH, thinning type: waste/production)

Latest full inventory data – SPH, MTH, BA (if no MTH is recorded but there is a MCH this will be substituted. If no BA but DBH is present this will be converted to provide a BA.

Planned harvest age, if no planned harvest date is recorded the default is 30 years.

If fields are missing or species other than radiata have been included an error list produced showing what fields in what areas are missing from what patches.

Patches with Attitude Missing when trying to Calculate the 300 Index

If all inputs meet the requirements of the 300 Index calculator the 300 Index values of patches will be updated.

300 Index Value Stored at the Patch Level in GeoMaster

As GeoMaster links seamlessly to GIS the 300 Index values can be shown spatially to show the site productivity of a forest.